Atomistic investigations of kappa-carbide precipitation in austenitic Fe-Mn-Al-C lightweight steels and the effect of Mo addition

作者：Moon Joonoh^*; Park Seong Jun; Jang Jae Hoon; Lee Tae Ho; Lee Chang Hoon; Hong Hyun Uk; Suh Dong Woo; Kim Seong Hoon; Han Heung Nam; Lee Bong Ho

来源：Scripta Materialia, 2017, 127: 97-101.

DOI：10.1016/j.scriptamat.2016.08.036

• Lightweight steel
• kappa-Carbide precipitation
• Atom probe tomography (APT)
• First-principles calculations
• Nanoindentation

The effect of Mo addition on precipitation behavior of kappa-(Fe,Mn)(3)AlC during aging in austenitic Fe-Mn-Al-C lightweight steels was investigated. First-principles calculations indicate that substitution of Fe or Mn by Mo in kappa-carbide is energetically unfavorable in the respect to formation energy, and it, moreover, increases strain energy contribution to interfacial energy between austenite matrix and kappa-carbide. Atom probe tomography (APT) and transmission electron microscopy (TEM) analysis showed the results consistent with the calculations, i.e., Mo didn't partition into kappa-carbide and delayed kappa-carbide precipitation. Finally, nanoindentation experiments presented that Mo addition changed the aging hardening behavior, corresponding to kappa-carbide precipitation behavior.

• 出版日期2017-1-15